It is undeniable that there is significant knowledge revolution in the field of information specifically through the last few decades which has raised the question of " Who has the knowledge, owns the creative strength and competitiveness? In addition, modern organizations look at knowledge as the solid base for the concept of innovation, creativity and development. In addition, they consistently strive for efficacy, efficiency, and exceptional performance. As a result, it can be observed that firms continually develop objectives and products that meet the wants and desires of consumers in their target markets. In light of the knowledge economy and the market's feedback, it is essential for businesses to acquire renewable knowledge and build a high-value intellectual capital that gives them a significant competitive and effective advantage. (Abu Fara, 2004). In a global and dynamic market, businesses must constantly monitor and track the actual experience that their brand provides to customers (Meyer & Schwager, 2007). Despite prior research indicating that customer satisfaction has a positive impact on business results, many companies still struggle to implement strategies to achieve them (Borowski 2015; Meyer & Schwager, 2007). There has been little academic research on the types of innovations and customer satisfaction in real estate companies. Because of changes in consumer taste and demand, there has been a recent increase in awareness of innovation. Furthermore, innovation allows businesses to expand and maintain their market share (Baldassarre et al., 2017). According to Pitelis (2009), innovation is a powerful tool for businesses to create value and gain a competitive advantage.

Innovation is a major shift that entails accelerating the development of new ideas and producing new products, services, and industrial processes (Nwachukwu, Chladkova & Fadeyi, 2018). Firms can produce value through creative actions to stay competitive. By maximising essential assets, resources, or opportunities, innovation allows a company to generate value from other enterprises. Companies can become more efficient and respond to changing market demand by implementing service, process, and marketing innovations. Service innovation benefits both the service provider and the customer, and it improves the service provider's competitive advantage (Hall et al., 2005). Process innovation is concerned with how products are made, supplied, and consumed (Trott, 2012). According to Prajogo (2016), process innovation refers to the unique strategy organisations employ to respond to market demand and opportunity. Because they have major strategic significance in producing competitive advantage for organisations, product and process kinds of innovation have dominated most discourse and empirical studies on innovations (Goedhuys & Veugelers, 2012). Marketing innovation focuses on the use of new marketing techniques as well as the efficient use of marketing resources and skills (Nwachukwu et al., 2018). Product design, packaging, advertising, distribution, and pricing of goods and services are all examples of marketing innovations (OECD, 2005). Customer satisfaction is an important metric for businesses to track. Customer satisfaction is a critical factor in achieving superior business performance (Pulles et al., 2014). Customers that are satisfaied with the service will stay with the company for a long time. As a result, businesses must take an innovative strategy in order to boost consumer satisfaction and retain clients. A greater knowledge of how successful a company is at supplying products and/or services to its consumers can be gained by tracking customer satisfaction levels. The Overall aim of this study is to evaluate the impact marketing knowledge on customer satisfaction with mediating role of marketing innovation in real estate development companies in Egypt. The study is guided by the following objectives:

1- To investigate how Marketing knowledge affect customer satisfaction in real estate development companies in Egypt.

2- To examine how Marketing knowledge affect marketing innovation in real estate development companies in Egypt.

3- To identify how marketing innovation affects customer satisfaction in real estate development companies in Egypt.

4- To investigate the mediation role of marketing innovation between Marketing knowledge and customer satisfaction in real estate development companies in Egypt.

Marketing knowledge is considered as the independent variable, marketing innovation is considered as the mediator variable, and customer satisfaction is considered as the dependent variable.

For the purpose of this research, the research population refers to customers who deals with Egyptian real estate developing companies. The research questionnaire was administered to nine hundred (900) respondents, 505 questionnaires representing 56.1% were returned, and 43 questionnaires representing 4.8% were incomplete or ineligible or refusals and 395 (43.9%) were not reached. There were 462 acceptable responses, a response rate 51.3%, which is highly adequate for the nature of this study.

In this Research Paper, the Amos 25.0 software package was used to perform the structural equation modelling (SEM) to investigate the inter-relationships between the constructs of the hypothesized model. Hypotheses Testing Following a confirmatory factor analysis, the valuation of the structural model through testing of the hypotheses underlying the research model is conducted.

Composite reliability (CR) is used to measure the reliability of a construct in the measurement model. CR is a more presenting way of overall reliability and it determines the consistency of the construct itself (Hair et al., 2019). The CR of Acquisition Process = 0.883, Conversion Process =0.875, Application Process =0.837, Protection Process = 0.828, Product Innovation = 0.894, Service Innovation = 0.829, Process Innovation = 0.764 and customer satisfaction=0.950). So, it clearly identified that in measurement model all construct have good reliability.

The average variances extracted (AVE) should always above 0.50 (Hair et al., 2019). Results show that average variances extracted (AVE) of the particular constructs (Acquisition Process = 0.605, Conversion Process =0.583, Application Process =0.564, Protection Process = 0.562, Product Innovation = 0.679, Service Innovation = 0.548, Process Innovation = 0.523 and customer satisfaction=0.705) are more than 0.500. Overall, these measurement results are satisfactory and suggest that it is appropriate to proceed with the evaluation of the structural model.

Measurement model Results: The 8 factor was subjected to CFA using the AMOS software. DF was 129 (it should be more than 0), c2 /DF has a value of 2.812, that is less than 3.0 (it should be less than or equal 3.0). The RMSEA was .062 (it should be less than 0.08). The TLI index was .941 which is very close to 1.0 (a value of 1.0 indicates perfect fit). The CFI was .950. All indices are close to a value of 1.0 in CFA, indicating that the measurement models provide good support for the factor structure determined through the CFA.

Structural model

Structural model summary. The results of structural' model using the AMOS software, shows that DF was 656 (it should be more than 0), c2 /DF has a value of 2.540, that is less than 3.0 (it should be less than or equal 3.0). The RMSEA was .057 (it should be less than 0.08). The TLI index was .910 which is very close to 1.0 (a value of 1.0 indicates perfect fit). The CFI was .916. All indices are close to a value of 1.0 in CFA, indicating that the measurement models provide good support for the factor structure determined through the CFA.

This researcher explores the analytical part performed to test the hypotheses the researcher is seeking to fulfill the research objectives. A summary of findings and conclusion could now be presented.

Regarding the first objective: To investigate how Marketing knowledge affect customer satisfaction in real estate development companies in Egypt. Due to the individual tests of significance of the relationship between the variables. It reveals that, as expected a positive relation between Marketing knowledge and customer satisfaction (β = 0.652, CR (Critical Ratio) = 8.456, CR > 1.96, p = 0.000, p<0.05). Therefore, (H1: Marketing knowledge has a positive effect on customer satisfaction in Real estate development companies in Egypt.) is supported. That result is consistent with Al-Hadrawi (2018) and Mehmood & Abedin (2017).

Regarding the second objective: To examine how Marketing knowledge affect marketing innovation in real estate development companies in Egypt. According to the analysis performed testing the relationship between the variables. H2: Marketing knowledge has a positive effect on marketing innovation in Real estate development companies in Egypt. is supported as the result shows that (β = 0.723, CR (Critical Ratio) = 13.189, CR > 1.96, p = 0.000, p<0.05), as it predicts that " Marketing knowledge has a positive effect on marketing innovation in Real estate development companies in Egypt". That result is consistent with Jean, et. al., (2014); Alrubaiee, et. al., (2013).

Regarding the Third objective: To identify how marketing innovation affects customer satisfaction in real estate development companies in Egypt. The result shows that H3: Marketing innovation has a positive effect on customer satisfaction in Real estate development companies in Egypt. (β = 0.265, CR (Critical Ratio) = 3.038, CR > 1.96, p = 0.002, p<0.05). is supported, as it predicts that "There is a positive relation between marketing innovation and on customer satisfaction". That result is consistent with YuSheng and Ibrahim (2020); and Castillo-Palacio (2016).

Regarding the Fourth objective: To investigate the mediation role of marketing innovation between Marketing knowledge and customer satisfaction in real estate development companies in Egypt. The results reveal a statistically significant indirect effect Marketing Knowledge and Customer satisfaction through marketing innovation (P = 0.005, P<0.05). The results of the mediation effect indicate that there is partial mediation effect of the marketing innovation between the relationship of Marketing Knowledge and Customer satisfaction.

This paper is conducted to empirically investigate the causal relationships between Marketing knowledge and customer satisfaction mediated by marketing innovation in real estate development companies in Egypt. A questionnaire is used for data collection and the Amos 25.0 software package was used to perform the structural equation modelling (SEM) to investigate the inter-relationships between the constructs of the hypothesized model. Accordingly, the study reveals that: the direct effect between Marketing knowledge and customer satisfaction is statistically significant. Therefore, the first hypothesis is supported. This result is consistent with Al-Hadrawi (2018). The direct effect between Marketing knowledge and marketing innovation is statistically significant. Thus, the second hypothesis is supported and this result is consistent with Jean, et. al., (2014). The direct effect between Marketing innovation and customer satisfaction is statistically significant. Therefore, the third hypothesis is supported and this result is consistent with YuSheng and Ibrahim (2020). The study also reveals a good contribution as the analysis indicates a partial mediation effect of marketing innovation between marketing knowledge and customer satisfaction. Considering the scare empirical studies regarding these constructs in real estate industry, particularly in the emerging market context, this paper enriches the literature.

This study shows that marketing knowledge, marketing innovation contributes to customer satisfaction. Therefore, Service innovation and Marketing innovations are dynamic capabilities that organizations must leverage. This study has practical implications for managers and their firms. To attract and keep customers, firms must provide innovative services more efficiently and effectively better than the competition (Feldman Barr and McNeilly, 2003).

- First: Because this study was cross-sectional, it is not possible to investigate the nature of cause-and-effect connections between the variables. Future study should therefore focus on the requirement for a longitudinal strategy.

- Second: As a method of data collection, the questionnaire also had its limitations and could not examine all the information in detail. The answers in the questionnaire were based on the customers' perception and did not take into account deeper explanations and reasons for choosing the selected answers. Additionally, few papers have empirically investigated the elements presented in this paper, so not all factors could be compared with previous research to reach relevant conclusions. These limitations also represent recommendations and guidelines for future studies.

- Third, because this study's sample was limited to one nation (Egypt) and the real estate development sector, it is important to proceed with caution when interpreting the results. Despite the fact that the research context is extremely specialized, it is thought that the conclusions apply to various fields and nations.

- Fourth: a convenience sample approach was used to gather information from respondents over a predetermined period of time, which led to a limitation. The range of respondents who might participate was restricted by the short time window for data collecting. Because responses are acquired based on respondents' accessibility and may not give a representative sample, the convenience sampling approach used to gather responses may have also limited the range of respondents who would participate.